Finding the Fourth Proportional to 3,078.58, 4,616.78 and 886.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,078.58 : 4,616.78 = 886.72 : x
2. Step 2: Convert to fraction form
   3,078.58/4,616.78 = 886.72/x
3. Step 3: Cross multiply
   3,078.58x = 4,616.78 × 886.72
4. Step 4: Simplify right side
   3,078.58x = 4,093,791.16
5. Step 5: Solve for x
   x = 4,093,791.16/3,078.58
6. Step 6: Final answer
   x = 1,329.77